Sam Smith alluded to reports of his split from 13 Reasons Why star Brandon Flynn during a show in gig in New York.

The singer was performing at the Barclays Center in New York City as part of his world tour when he opened the show by candidly telling his audience that he'd been having a tough time.

"I know that everyone in this room right now is going through some s**t. I know I'm going through some s**t," he said, reports E! News .

"And tonight I want all of us to just leave all of our worries and all of our heartache aside and let's have some fun. Let's sing as loud as we can."

The pair had been dating for nine months (Image: samsmithworld/Instagram)

Sam has dedicated songs on his new album to Brandon (Image: Splash News)

Sam and Brandon, who were spotted together as recently as two weeks ago in Beverly Hills, had been dating for nine months.

It's believed that Londoner Sam, 26, and 24-year-old Brandon, who hails from Miami, called time on their relationship last week.

They started dating not long before Sam brought out his second album, The Thrill Of It All, in November last year.

Sam has now deleted a number of loved-up snaps from their time together from his Instagram account.

"I know I'm going through some s**t," he told the crowd (Image: REX/Shutterstock)

The pair are said to be too busy with their careers to pursue a relationship (Image: REX/Shutterstock)

A source close to the star told The Sun : "Sam and Brandon had a real whirlwind romance. They really fell for each other.

"But they are both so busy with their careers and unfortunately things just haven’t worked out.

"Sam is obviously devastated. This is the most significant relationship he has ever had."

The singer is currently on tour across the US, kicking off the string of dates just as they decided to split.

Brandon at the Balmain show during Paris Fashion Week (Image: REX/Shutterstock)

He'll be on the road until November.

Brandon, who plays Justin Foley in the hit Netflix drama, visited Sam in the UK just last month, when they went on a fun-filled date to Alton Towers and headed to the theatre to watch Harry Potter and the Cursed Child.

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Sam said earlier this year that he was so happy in his relationship that it would be reflected in his new music.

He said: "I’m in a relationship right now and for the first time, I think I deserve to be happy.